Saw-sharpening machine.



WITNESSES J. K. CHALMERS.

SAW SHARPENING MACHINE.

APPLICATION FILED FEB. 16. 1915.

Patented J1me 20, 1916.

3 SHEETS-SHEET I.

J. K. CHALMERS.

SAW SHARPENING MACHINE.

APPLICATION FILED FEB- 16. 1915- 3 SHEETS-SHEET 2. I

Patented. J une, 20, 1916.

J. K. CHALMERS.

SAW SHARPENING MACHINE.

APPLICATION FILED FEB. 16. I915 Patentd June 20, 1916.

3 SHEETS-SHEET 3.

M a e if 1 ft JAMES K. CHALMERS, OF TORONTO, ONTARIG, CANADA.

SAW--HABPENING MACHINE.

Application filed February 16, 1915.

To all whom it may concern:

Be it known that I, JAMEs KEELER OHALMERS, a citizen of the United States of America, and resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Saw-Sharpening Machines, described in the following specification and illustrated in the accompanying drawings, that form part of the same.

The principal objects of the invention are, to render the operation and use of the ma chine practically universal so that any style of tooth may be accurately ground, and to devise a construction of machine in which the adjustments for grinding various shapes and dimensions of teeth are easily and quickly effected.

A further object is to so simplify the machine that it may be manufactured very cheaply.

The principal feature of the invention consists in the novel construction and arrangement of parts, whereby the grinder wheel carriage and mechanism for feeding the saw are so operated as to effect a continuous and uniform contact of the grinder wheel with any desirable shape of teeth.

In the drawings, Figure 1 is a front elevational view of a machine constructed in accordance with this invention. Fig. 2 is a front elevational view of the machine with the saw supporting attachments removed and showing the grinder wheel in a slightly different position. Fig. 3 is an end elevational view of the machine. Fig. 4; is a perspective view of a modification of the grinder wheel support. Fig. 5 is a perspective view of the modification shown in Fig. 4, showing its operation in a different manner. Fig. 6 is an end elevational view showing the arrangement of the form of the device illustrated in Figs. 1 and 5. Fig. 7 is a diagrammatic illustration of the shapes of several forms of teeth. Fig. 8 is an enlarged perspective detail of an adjustable eccentric cam.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, 1 is the frame of the machine which is preferably rectangular and formed with an open top.

2 is a carriage arranged at the front side of the machine and slidably supported on Specification of Letters latent.

Patented June 2d, 121%.

Serial 110. 8,628.

the front legs 3 and adapted to move vertically thereon.

4 is a shaft jourualed in the ends 5 of the carriage 2 and extending across the front of the machine having spur pinions 6 mounted thereon and meshing with toothed racks 7 arranged on said legs. Suitable pawls 8 are pivotally supported on the carriage adapted to engage the pinions 6 to hold them securely in an adjusted position. The shaft 4% is preferably provided with a squared end '9 to receive a suitable crank key for rotating the shaft to adjust the vertical position of the carriage.

10 is a block slidably arranged on the carriage 2 having a horizontally threaded orifice through which the threaded shaft 11 j ournaled horizontally in the carriage 2 we tends. The block 10 is adjusted upon the carriage 2 by rotating the threaded shaft 11. This block forms the holder for the saw, being provided with'a tapered gripping block 12 arranged on a threaded spindle 13 adapted to hold circular forms of saws.

1 1 is a bracket secured to the top of the block 10 having a horizontal groove 15 adapted to receive the back-edge of the band saw and to hold it with the side face engaging the front edge 16 of the frame.

17 is a guide arm pivotally secured to a rigid bracket on the frame and adapted to engage the outer side of the saw to hold same snugly against the guide and to prevent vibration. This arm is preferably adjustable in its length;

18 is the grinder wheel carriage supporting frame pivotally supported from the lug 19 and adjustably held by the bolt 20 secured in the lug 21 and extending through the slot 22 in the arm 23. The upper end of the carriage support is of substantially rectangular shape having the slides 24: in which is held the carriage 25.

26 is the grinderwheel shaft journaled in bearings'in the sides of the carriage 25, extending transversely thereof and 27 is the grinder wheel secured at the lower end.

28 is a drive pulley secured to the shaft 26 between the bearings on the carriage.

29 is an adjustable bracket arranged intermediate of the width of the frame and supported on a cross bar 30 and here shown slidable thereon.

31 is a lever pivotally supported on a pin acute, angle.

32 carried in the bracket 29, said lever having a plurality of adjustment holes 33 thereln'to allow of the change of the action of the lever. turned downwardly and is provided with a roller 35 at the extremity. V

36 is a lever pivoted upon the pin 32 car riedlin the bracket 29 and having pivotally secured to the end 37 a sleeve member 38 which extends upwardly therefrom at an 39is a rod slidably arranged in the sleeve 38and'. provided 'with a collar 40 adapted to be engaged by the upper end of the sleeve 38. The upper threaded end of the rod 39 extends through a swivel block 41 arranged 1n the grinder carriage 25. The rod and sleeve form the connecting members adapted to operate the carriage 25 in its'support. I

42 is an adjustable stop screw threaded in the lug43 secured to the'carriage support 18, said'screwbeingadapted to engage the lower'end of the grinderwheel carriage and to'limit its downward movement, the'sleeve 38 being loosely arranged on the rod 39 so that the said sleeve and the lever 36 may continue to move downwardly after the carriage has been arrested.

44 is an arm pivotally supported from a lug 45 on the frame and extending downwardly having secured toits lower end a pivotal shoe 46 which shoe is adapted to engage the roller 35 on the end of the lever 31. An adjusting screw. 47 is provided to alter the relative angle of inclination of the shoe 46 in relation to the arm 44.

48 is ashaft journaled in brackets 49 secured to one end of the frame, said shaft extending above the end 50 of the levers 31 and 36. i

51 is an arm pivotally mounted on the shaft 48 having the upper end extending through the open top of the frame.

52 is a rod extending between the arm 51 and the arm 44 having the adjustable end pieces 53'and 54 pivotally connected to said arms. The arm 44 is provided with a plurality of holes 55 to allow of adjustment of the connection of the rod' 52 to vary the throw of the arm 51 upon its pivot.

56 is a bracket pivotally mounted on the upper end of the rod 51 having a slidable member 57 adjustably supported from its under side, a suitable adjusting screw 58 being provided on its outer end. The member 57 is provided with a laterally and for- 7 pockets formed in the ends 50 in which are The end 34 of the lever 31 is arranged roller contact members 60 projecting above the upper surface.

61 is an eccentric cam secured to the shaft 48 adapted to engage the rollers 60 and to swing the levers 31 and 36 on their pivots and thereby operating the grinder wheel carriage and the saw feeding mechanism. These levers may be operated to swing in unison by a single roller eccentric or one may be made to hesitate. This effect may be produced by utilizing a different form of eccentric or cam.

In Fig. 8 an eccentric is shown formed with recesses in the peripheral face in which are secured the blocks 62, which blocks may be of any desirable peripheral shape to give the required result of action to the lever 36 while the lever 31 continues to operate to the full stroke of the eccentric. The shaft 48 is operated by any suitable form of gear, a Worm "drive being here shown carried on a shaft 63. The grinder wheel is driven by a belt'64 extending around the shaft 63 and pulleys 65 carried on brackets 66.

In Figs. 4 and 5, a slight modification of the grinder wheel carriage is shown. A bracket 67 is secured to the slide 68 and pivotally secured to the upper end of this bracket is an arm 69 which arm is formed with a longitudinal bearing 7 0.

71 is a bracket having at the upper end a pin 72 extending into and journaled in the bearing 7 0, being rotatably held by the collar 73 at the upper end. The lower end of the bracket 71 is formed with a horizontally ar ranged journal 74 in which is journaled a spindle carrying the grinder wheel 75. A suitable pulley 76 is arranged on the grinder wheel spindle and corresponding grooved pulleys 77 and 78 are arranged at the upper end of the bracket 67, the drive belt being extended around these pulleys to operate the grinder.

79 is a lever supported on an adjustable pivot 80 carried in the lug 81 on the frame, said lever having a forked end 82 engaging a cam 83 arranged on the shaft 48.

84 is a rod secured to the upper end of the lever 79 and pivotally connected to the outer end of the journal portion 74 of the bracket 71.

The arm 69 may be arranged to swing upon its pivot or may be held rigid upon said pivot by the lock screw 85 and the bracket may be swung upon the pin 72, a locking screw 86 being provided in the sleeve portion 70.

In the operation and use of this machine, the saw is placed in the holder carried by the block 10 on the carriage 2 and the carriage and block are adjusted to bring the teeth into the proper relative location with the grinder wheel. The adjustable member 57 carrying the pin 59 is then set so that the pin will drop to the bottom of one tooth and as the said arm is swung outwardly the pin will carry along to the next succeeding tooth. Any desired adjustment can be had for any length or spacing of teeth by the adjustment of the member 58 or by the shifting of the adjusting rod 52 in the holes 55 in the arm 44.. The shoe 46 carried on the bottom end of the arm 44: is adjusted to the desired angle to co-act with the roller 35 on the lever 31. The adjustment of this shoe affects the movement of the arm 44 and consequently of the saw and by its adjustment the movement of the saw can be so regulated as to cause a quick or slow forward motion 7 of tooth.

The grinder wheel carriage 25 is reciprocated in its guides by means of the rod 39, sleeve 38 and lever 36. The stop screw 42 may be adjusted to arrest the downward movement of the grinder wheel carriage at any point and thus limit the downward movement of the grinder wheel forming a positive regulation for the depth of the teeth. The movement of the lever 36 will not however be interfered with as the rod 39 slips freely in the sleeve 38 thus the lever may swing farther downwardly and return.

teeth is thus ground horizontally or circumferentially as the case may be, with a band saw or circular saw.

The carriage is ultimately raised slowly during the forward movement of the saw causing the grinding of the sloping back of the tooth and when it has reached its limit of upward movement the feed device has reached its forward limit. The carriage is then dropped to grind the straight face of the tooth while the feeding arm is moved back to its normal position.

The grinder wheel carriage and feed arm are operated from the cams 61 arranged on the shaft 48 and as these eccentric cams rotate they depress the ends of the levers 31 and 36 causing the rising of the opposite ends thereof, a suitable handle being provided at one end of the lever 36 to allow for hand movement during adjustment.

It will be seen that through the adjustment of the levers 31 and 36, and their op,- erating cams, the shoe 46 and the rod connecting the arms 44 and 51, practically any desirable movement f the grinder wheel and saw may be obtained. The result of this range of adjustment is that any form of teeth may be ground with accuracy.

In cases where it is desirable to bevel the edge of a tooth, it is merely necessary to change the grinder wheel carriage, substituting therefor the carriage illustrated in. Figs. i and 5.

For some formations of teeth the grinder spindle is swung laterally at an angle to the plane of the saw as illustrated'in Fig. 4: and in other cases the axis of the grinder wheel spindle is maintained parallel with the saw but the bracket carrying the grinder is swung upon the pivot parallel with the spindle as illustrated in Fig. 5 so that the center of the grinder wheel is swung to one side of the plane of the saw. The swinging of the grinder wheel is effected by the cam 83 engaging the forked end of the lever 79 and operating the rod 84: to swing the bracket 71 on its pivot.

The method of driving the various parts is very simple and by the peculiar structure herein shown and described an unlimited adjustment to suit practically every kind of tooth, both metal and wood cutting may be obtained.

In order to grind the straight tops of metal cutting teeth, an adjustment is effected between the cam 61 and the shoe 46 so that at a certain predetermined point the upward movement of the grinder wheel carriage is arrested, though the forward movement of the saw is continued. If the top of the tooth is required to be perfectly fiat the cam will be so arranged as to maintain the grinder wheel carriage perfectly stationary but if it is to be sloped or curved, the cam is formed to effect a gradual rise of the grinder wheel.

What I claim as my invention is 1. A saw sharpening machine, comprising, a frame, a grinder wheel carriage slidably mounted on the said frame, a horizontally disposed lever pivotally mounted intermediate of its length on said frame, an adjustable rod pivotally secured to one end of said lever and operatively connected with said carriage, a horizontally disposed lever arranged adjacent to the aforesaid lever and pivotally supported intermediate of its length, an arm pivotally suspended from the frame and operatively engaging one end of the latter lever, a pivotal arm supporting the saw feeding member, means operatively connecting said pivotal arms, a cam shaft extending across the free ends of 'said horizontal levers, a cam secured to the cam shaft and adapted to engage said levers to operate them in unison, and means for driving the cam shaft.

2. A saw sharpening machine, comprising, a frame, a grinder wheel carriage slidably riage, means ground, an arm pivotally mounted on sald mounted to operate in a vertical plane on said frame, means for operating said carfor supportingthe saw to be pivotal arms, an adjustable inclined member secured to the lower end of the second arm, V a lever pivotally mounted intermediate of its length and having one end engaging said inclined member, acam shaft extending transversely of theframe, and a cam operatively engaging the freeend of said lever to rock sameuponits pivotal support to operate the saw feed.

'3. A saw sharpening mach1ne, compr1sing, a frame, a grinder wheel carriage slid- V V I ably mounted to operate in a vertical plane on said frame, means for operating said carriage, means for supporting the saw to be ground, an arm pivotally mounted on said frame and supporting a member adapted to engage the teeth of the saw and to move them in relation to the grinder wheel,

7 an arm pivotally suspended from said frame,

a shoe pivotally mounted on the lower, end of said suspended arm, means for adjusting the inclination of said shoe in relation a rod pivotally secured to the to said arm, feed arm and adjustably connected to the suspended arm and a lever pivot-ally mounted intermediate of its length and having a roller upon one end thereof engaging said shoe,'a cam shaft extending transversely of the machine and arranged above the outer end of said lever, and an adjustable cam mounted on said cam shaft adapted to' en gage and operate said lever to operate the saw: feed.' 7

4. A saw sharpening machine, comprising, a frame, a grinder wheel carriage slidably mounted to operate in a vertical plane on said frame, means for operating said carriage, means for supporting the saw to be ground,'an arm pivotally mounted on said frame and supporting a member adapted to engage the teeth of the saw and to move them .in relation to the grinder wheel, an arm pivotally suspended from said frame, adjustable means forconnecting said arms to cause them to swing in unison, an inclined I '5, In a saw sharpening machine, the combination with a frame, a grinder wheel carriage slidably mounted on said frame, and

means for supporting the saw, of a lever pivotally mounted on the frame, a sleeve member pivoted on said lever, a rod pivotally connected at its upper end to said earriage and slidably arranged in said sleeve and having a stop adapted to be engaged by the sleeve in its upward movement, adjustable means for limiting the dowm and move ment of the carriage, means for feeding the saw, and means for operating said lever independently of the movement of the feed mechanism.

6. In a saw sharpening machine, the eombination with a frame, a grinder wheel carriage slidably mounted on said fame, and

' means for supporting the saw, of a lever mounted on an adjustable pivot on the frame, .a sleeve pivotally mounted on one end of said lever, a rod adjustably and pivotally secured to said carriage and extending into said sleeve and adapted to slide therein, said rod having a stop adapted to engage the upper end of said sleeve, an adjustable stop for limiting the downward movement of said carriage, adjustable means for rocking said lever, and means for coincidently feeding the saw.

7. A saw sharpening machine, comprising, a main frame, a frame pivotally mounted on said main frame and adapted to swing in a vertical plane, a grinder wheel carriage slidably mounted on said pivotal frame, means arranged on said main frame for supporting the saw, a lever pivotally mounted on the main frame, means operatively connecting one end of said lever to said carriage and adapted to reciprocate the same thereon, an adjustable cam engaging the free end of said lever, and means for feeding the saw coincident with the movement of the grinder wheel carriage.

8. In a saw sharpening machine, a frame, a grinder wheel carriage slidable on said frame, means for supporting the saw, a pair of levers pivotally mounted horizontally in said frame, means connected to one end of said levers for lifting said carriage, means for limiting the downward movement of said carriage, adjustable means for feeding the saw at varying speeds operatively engaging the other lever, a shaft extending transversely above the free end of said levers, an adjustable eccentric cam on said ed to be swung-laterally upon said pivot, a grinder wheel shaft carried 011 said bracket, means for operating said grinder wheel shaft, and means for swinging said bracket on its pivot.

10. A saw sharpening machine, comprising, a frame, a carriage slidably mounted in guides in said frame, means for reciprocating said carriage, means for holding the saw, means for feeding the saw, a bracket mounted on said carriage, a bracket having a pin mounted in the journal in the aforesaid b 'acket and supporting a horizontally arranged journal on its lower end, a grinder wheel spindle journaled in said lower journal, means for operating said spindle, and means for swinging said bracket upon its pivot.

11. A saw sharpening machine, comprising, a frame, a carriage slidably mounted in of its length in said frame, a rod connecting the end of said arm with said grinder wheel bracket, and a cam operatively connected with the free end of said arm.

Signed at the city ofToronto, county of York, Ontario, Canada, this fifth day .of

February 1915.

JAMES K. CHALMERS. Witnesses:

E. HERON, H. C. TRIMBLE.

Gopiea or this patent may be obtained for five cents each, by addreasing the Commissioner a1 JE'ateata. Washington, D. G. 

